This design uses a 74HC138 to expand two 74HC574s to form a row scan, and then uses two 74HC574s to form a column scan to drive four 8*8 LED displays. In this design, two dot matrix images of Chinese characters are given, and it is required to display \"Henan Polytechnic University\" on the LED display in turn. The set button functions: Button 0: Reset Button 1: Restart inputting Chinese characters Button 2: Enter the next Chinese character Button 3: Full screen light
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